set desktop to extend/clone in dual display in windows

How can I programmaticly change windows display setting from 开发者_开发问答Extend desktop to Clone desktop and the other way around ?

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If you are using Windows7 you can use DisplaySwitch.exe file with parameters /extend and /clone

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This issue isn't going to be a simple "call this method in this .NET class" I don't believe. However, it can be done using the EnumDisplaySettingsEx() API. Here is a SO question similar to yours that has the information you need to dig into this issue:

How do I enable a second monitor in C#?